8 replies to this topic

[BrunoPescarolli]

Hello

I am setting up a code to detect the presence of the Micro Sd with Netduino Plus.

using System;
using System.Net;
using System.IO;
using System.Threading;
using SecretLabs.NETMF.IO;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.NetduinoPlus;
using Microsoft.SPOT.Hardware;
using Microsoft.SPOT.Net;
using Microsoft.SPOT;

public class SD_CARD1

{

    static InterruptPort SDPORTA = new InterruptPort((Cpu.Pin)57, false, Port.ResistorMode.PullUp, Port.InterruptMode.InterruptEdgeBoth);
   public static void Main()
   {

       OutputPort SD = new OutputPort((Cpu.Pin)25, false);
       InputPort SD_DETECTADO = new InputPort((Cpu.Pin)57, false, Port.ResistorMode.PullUp);

       Debug.Print("SD CARD DETECTADO!" + (SD_DETECTADO.Read().ToString()));
       SD_DETECTADO.Dispose();

       SDPORTA.OnInterrupt += SDPORTA_OnInterrupt;
   }


   static void SDPORTA_OnInterrupt(uint data1, uint data2, DateTime data)
   {
       Debug.Print("SD CARD foi: " + ((!SDPORTA.Read()) ? "LOCALIZADO" : "REMOVIDO"));
   }
}

By compiling the code OK! but when you start the application returns an error writing the Following:
"An unhandled exception of type 'System.Exception' occurred in Microsoft.SPOT.Hardware.dll"

I do not know if there's anything wrong with the code!

but if something wrong can someone help me?

[nakchak]

Hi

Try adding a reference to Microsoft.SPOT.IO

Also you could use the events in the RemovableMedia object to detect insert and eject

i.e.

public static void Main(){
 RemovableMedia.Insert += new InsertEventHandler(RemovableMedia_Insert);
 RemovableMedia.Eject += new EjectEventHandler(RemovableMedia_Eject);
 Thread.Sleep(Timeout.Infinite);
}
void RemovableMedia_Eject(object sender, MediaEventArgs e) {
 Debug.Print("Ejected");
}

void RemovableMedia_Insert(object sender, MediaEventArgs e) {
 Debug.Print("Inserted");
}

Nak.

[ash]

i just did this:

            DirectoryInfo dirinfo = new DirectoryInfo(@"\SD\Bin");
            if (dirinfo.Exists)
                GotSDCard = true;

[nakchak]

i just did this:

            DirectoryInfo dirinfo = new DirectoryInfo(@"\SD\Bin");
            if (dirinfo.Exists)
                GotSDCard = true;

I would imagine you would get an exception if their is no SD card present, where as using the events is far more reliable (and effcient as no objects are created/garbage collected) way of setting a bool to indicate if a card is present, as the event is triggered by the microswitch on the socket, so even if you were to access the SD card in a binary manner (via SPI or something like that if you have a need for a custom FS/Format) the events would still be raised.

Nak.

[BrunoPescarolli]

Help me please! I am new to the area

[BrunoPescarolli]

I ran the code that nakchak posted

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.IO;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.NetduinoPlus;

namespace SdCard
{
    public class Program
    {
        public static void Main()
        {
            RemovableMedia.Insert += new InsertEventHandler(RemovableMedia_Insert);
            RemovableMedia.Eject += new EjectEventHandler(RemovableMedia_Eject);
            Thread.Sleep(Timeout.Infinite);
        }
        void RemovableMedia_Eject(object sender, MediaEventArgs e)
        {
            Debug.Print("Ejected");
        }

        void RemovableMedia_Insert(object sender, MediaEventArgs e)
        {
            Debug.Print("Inserted");
        }

    }
}

The code is perfect but returns errors:
"An object reference is required for the non-static field, method, or property 'SdCard.Program.RemovableMedia_Insert(object, Microsoft.SPOT.IO.MediaEventArgs)'"

"An object reference is required for the non-static field, method, or property 'SdCard.Program.RemovableMedia_Eject(object, Microsoft.SPOT.IO.MediaEventArgs)'"

Should be small thing wrong in the code.
How to solve?

[Stefan]

You should make both methods static in this case:

using System;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.IO;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.NetduinoPlus;

namespace SdCard
{
    public class Program
    {
        public static void Main()
        {
            RemovableMedia.Insert += new InsertEventHandler(RemovableMedia_Insert);
            RemovableMedia.Eject += new EjectEventHandler(RemovableMedia_Eject);
            Thread.Sleep(Timeout.Infinite);
        }

        static void RemovableMedia_Eject(object sender, MediaEventArgs e)
        {
            Debug.Print("Ejected");
        }

        static void RemovableMedia_Insert(object sender, MediaEventArgs e)
        {
            Debug.Print("Inserted");
        }
    }
}

This is because it's in de main program, which is also set up to be static.

[BrunoPescarolli]

Hi Stefan the code running OK now! no ERROR's! I detect the Sd Card OK? I now have access to it like a removable disk Whether have any link that talks about this?

[cSharper]

Hi all,

 

I know this thread is old, but is there an updated way to perform this exact task?

Right now when I run the sample program given, I get this error:

Inserted
A first chance exception of type 'System.IO.IOException' occurred in Microsoft.SPOT.IO.dll
An unhandled exception of type 'System.IO.IOException' occurred in Microsoft.SPOT.IO.dll


 Uncaught exception 
Ejected
Inserted
Inserted